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Medieval European crossbows had a much smaller draw length than bows, so that for the same energy to be imparted to the projectile the crossbow had to have a much higher draw weight. A direct comparison between a fast hand-drawn replica crossbow and a longbow shows a 6:10 rate of shooting [92] or a 4:9 rate within 30 seconds and comparable weapons.
let-off (measure) – The difference between a compound bow's holding weight and draw weight. Expressed as a percentage of the draw weight; for example, a bow with a draw weight of 70 lb and holding weight of 14 lb would have 80% let-off. limb-driven rest (equipment) – A drop-away rest that is mechanically linked to one of a compound bow's limbs.
Hunting crossbow. Big game hunting requires a draw weight of more than 35 pounds-force (16 kilograms-force). For larger game such as elk or moose, more than 50 lbf (23 kgf) is suggested. Most male American archers can draw a bow rated at 50–60 lbf (23–27 kgf), most women 30–40 lbf (14–18 kgf). [6]
The same takedown bow is shown disassembled on a travel case, and assembled for use. A takedown bow is a bow assembled out of a riser and two limbs to make a working bow when strung.
When the archer commences the draw, mechanical advantage is at its greatest and the bow limbs are only pre-stressed to the strung position; therefore drawing weight is at a minimum. However, the drawing weight rapidly increases because mechanical advantage reduces (consider the string is pulling more and more directly on the limbs) and stresses ...
Thus, if other factors are equal, a standard Han dynasty crossbow with a ≈387-pound (176 kg) draw weight and a 20–21-inch (510–530 mm) powerstroke would have comparable levels of power to a medieval European crossbow with a 1,200-pound (540 kg) draw weight and a 6–7-inch (150–180 mm) powerstroke. [97] [98]
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